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Poster: Scrim Date: Nov 15, 2006 5:11pm
Forum: GratefulDead Subject: PCM source

Pulse code modulation.

I was looking at the text sheet for a show and the master reel goes to PCM at 44khz, etc. I see the term PCM quite a bit when the seeder is trying to be very explicit in the recording chain. I also saw a text sheet in where the dude said that "he searched all over for a non-PCM seed..."

I understand that the mini-plug microphone jack on most computers is 44khz. Is this what they are plugging into to record these shows?

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Poster: deadmax Date: Nov 15, 2006 5:50pm
Forum: GratefulDead Subject: Re: PCM source

...a WAV file can have been sampled at any sampling rate from 10khz to 100khz. 44khz being CD quality or PCM.

Non-PCM must mean a quicker, or larger, sampling rate because 95khz will return more "true" sound than only sampling it 44khz.

Hope this helps.

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Poster: Scrim Date: Nov 15, 2006 6:28pm
Forum: GratefulDead Subject: Re: PCM source

Yes, thanks!

I was looking at new soundcards and they brag about their high sampling rates, saying that it is way above the standard 44khz. Their sales pitch makes it seem that 44khz may not be that good, but I didn't realize that it was at least considered CD quality.

knowing how fanatical tapers can be, and audiophiles in general, I understand why someone might be seeking the purest of sources.

This probably doesn't mean that the 44khz guys are taping through the mini-plug, it's just the sampling rate of the analog inputs on the soundcard.

All cleared up, thank you!

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Poster: deadmax Date: Nov 15, 2006 7:21pm
Forum: GratefulDead Subject: Re: PCM source

Glad to be able to clear.

You're right, of course, about the tapers and when they get into their lingo slammin I'm lost.

But, I teach computer networking for a living and we just finished the chapter on Sound on Monday so it was fresh in my mind.

Peace

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Poster: deadmax Date: Nov 15, 2006 5:37pm
Forum: GratefulDead Subject: Re: PCM source

I might be wrong about how that is used in recording a show but I do know that 44khz is a sampling rate that is considered CD Quality which means that the digital equipment is taking a part of the Analog Wave (the music) 44,000 times a second.

Which means it is not getting the full Wave (sound wave) which some purists feel is the only true sound. Problem is, our ears can't hear the entire Wave anyway because if we could hear every little sound that was out there we would all be insane. Think about dog whistles.

The "experts" have determined that anything over 44khz is too much for the ear to process and makes the file Waaaay too big.

I start to run out of steam as to whether or not a Wave file is CD quality or if its better. I'll check. Be right back...